Mesoglea

This is probably Mesoglea, "the translucent, inert, jelly-like substance that makes up most of the bodies of most comb jellies and some other primitive sea creatures. It acts as the creatures' structural support in water, as they lack bones or cartilage, -endo or exoskeletons or similar means of support. Because mesoglea is a gel with such a high water content, these creatures tend to collapse on land. " -- Wikipedia

These globs are often found in the seagrass beds off Ken Thompson Park on Sarasota's City Island.